Core taking device



March 1, 1932. G. 1. BARRETT ET Al.

vCORE TAKING DEVICEv Filed July 2, 1928 2 Sheets-Sheet 1 March 1, 1932 G. J. BARRETT ET Al. 1,847,423

GORE TAKING DEVICE Filed July 2, 192e 2 sheets-sheet 2 Patented Mar. l, 1932 UNITED STATES PATENT OFFICE GEORGE J'. BARRETT, OF BEAUMONT, AND SOSTHENE ROBICHAUX,IOF SARATOGA, TEXAS, ASSIGNORS F SEVEN PER- CENT TO WM. J'. MILLER conn TAKING DEVICE Application led July 2, 1928. Serial N0. 289,893.

This invention relates to new and useful improvements in a core taking apparatus.

One object of the invention is to provide an apparatus of the character described that may be readily assembled with a drilling tool and whereb a core of the strata being pierced may bey rea ily formed and withdrawn to the surface for inspection.

Another object of the invention is to proo vide a device of the character described whereby the core, as formed, may be preserved intact and uncontaminated and withdrawn independent of the drill stem to which the drill is attached.

5 A further feature of the invention resides in the provision of novel means whereby the core forming apparatus may be locked to rotate with the drill stem and released to permit its withdrawal independent of the stem.

l With the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts an example of which is given in this specication and illusi trated in the accompanying drawings, where- Figure 1 shows a side elevation, partly in section, of the drill and drill stem with the core taking device therein.

' Figure 2 shows a vertical sectional view of the upperend of the core taking device, assembled with the drill stem.

Figure 3 shows a fragmentary vertical lsectional view of a fishing tool employed.

Figure 4 shows a fragmentary view of an intermediate section of the core taking device assembled with the drill stem.

Figure 5 shows a cross sectional view thereof takenlon the line 5-5 of Figure 4.

Figure 6 shows a side elevation of the up-l per end of the core taking apparatus, partly in section and shown in a released position.

Referring now particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 1 designates a drill stem, and a drill bit 2 is attached to the lower end of said stem, having an axial bore 3. There is a core barrel comprising the upper and lower sections 4 and 5. The lower end of the core barrel is fitted through the bore 3 and the core. forming bit 6 is attached thereto. The v barrel section 5 -has an annular rib 7 therearound which serves to center it inthe stem 1 and the sections 4 and 5 are preferably connccted by threads in the conventional manner. Threaded into the upper end of the barrel there is a valve casing 8 having an axial channel 9 therethrough whose upper x.Gnd is enlarged forming a valve chamber 10 in which the ball valve 1l is located, said valve closing the channely 9 to the passage of fluid downwardly, said valve lifting, however, to permit the upward passage of fluid. Threaded into ther upper end of thevalve` casing 8 there is a cylindrical anchor 12 having opposing vertical slots 13, 13 therein with the intervening web 14 between said slots.

The lower end of this anchor 12 forms a stop i limiting the upward movement of the valve 11.

There is a tubular housing 15 whose lower end is threaded onto said anchor and screwed into the upper end of said housing there is` a gland 16 having an axial bearing 17. Fitted into the housing 15 there is a release head 18 having a stem 19 which works through the bearing 17 and attached to the upper end of said stem there is a nut adapted to engage tne gland 16. The head 18 and nut 20 are spaced apart a sutlicient distance to permit a limited movement of said head in the housing.

The lower end of said head has the opposing disposed upwardly converging notches 21, 21 forming between them a release wedge 22, whose opposite sides have upwardly converging faces 23, 23. Oppositely disposed levers 24, 24 are 'provided whose lower ends 25, 25, are inwardly turned and engage under 'the web 14. These levers embrace said web and their upper ends are inwardly offset forming external shoulders 26, 26. Releaszu l ing arms 27, 27 are provided whose upper ends are inwardly turned forming the releasing ngers 28, 28 whose free ends ride upon the corresponding faces 23, 23 and beneath said 'lingers the arms 27 are connected A bythe cross links 29 whose ends are pivotally connected to said arms 27. The lower ends of the respective levers 24. A section of the drill stem, as 31, is enlarged and threaded into the upper end of said enlarged section thereis an anchor ring 32 whose upper side converges downwardly and depen ingy from this ring there is an abutment 33. Interposed `between the upper ends |of the levers 24 and extending through an opening in the web 14 is a coil push spring 34. When it is desired to take a core the device is assembled as shown in Figures 1 and 2 and let down through the drill stem and it will be carried downwardly by gravity, until the lower end of the housing 15 engages the ring 32. The rib 7 will hold the core barrel centered relative to the bit 2 so that the lower end of said barrel will enter the bore 3. The head 18 will be held by gravity in its lower position and when the shoulders 26 pass beneath the ring 32 the spring 34 will force the levers 24 outwardly causing the shoulders 26 to engage under said ring 32. The core barrel will thereby be anchored against longitudinal movement in the drill stem'. As the stem is now rotated to proceed with the drilling operations, the abutment 33 will engage one of the levers 24 and this will force the barrel to rotate with said stem 1 and as drilling proceeds, a core will be formed which will pass into said core barrel. As the barrel is filled with the core any fluid that may be therein above the core will be forced out through the channel 9, the valve 11 lifting to permit this.

Upstanding from the upper end of the stem 19 there is a conical shaped head 35. When the core is completed, a fishing tool may be let down through the drill stem and engaged with said head 35. An upward pull on said fishing tool will first cause the head 18 to move upwardly in the hhousing 15 and this in turn will cause the wedge 22 to spread the fingers 28. The lower ends of the arms 27 will thereby be moved inwardly releasing the shoulders 26 from the ring 32 as shown in Figure 6.

Meanwhile the head 18 will have engaged the lower end of the gland 16 and the entire device may be thereupon withdrawn from the drill stem by said fishing tool. During the withdrawal operation the valve 11' will effectively close the channel 9 and the core will thus be held against dropping out of the barrel 5. v

Any conventional type of fishing tool may be employed. A preferred type is shown in Figure 3 and includes a tubular body 36, having oppositely disposed dogs 37, 37 pivotally mounted therein. The lower ends 38,38 of these dogs are inwardly turned and thus adapted to engage under the head 35 and between the upper ends of said dogs, there is a push spring 39 adapted to hold the .dogs

1n such engagement. The fishing tool may be let downby a suitable cable, (not shown) and the head 35 will enter between the lower ends of the dogs and spread them and pass above said inwardlyturned ends 38 which will thereupon engage under said head. When the core taking device has been withdrawn the dogs 37 may be released from the head 35 by pressing their upper ends inwardly and oppositely disposed openings 40, 40 have been provided in the body 36' for access to said upper ends for the purpose indicated.

While we have shown what we now consider the preferred form of the invention it is obvious that mechanical changes may be made therein and equivalents substituted for the parts shown and we reserve the right to make such mechanical changes and substitutions as may be found desirable within the scope of the appended claims.

What we claim is 1. The combination with a drill stem and a drilling tool attached to the lower end thereof and having an axial bearing, of a core barrel in the stem whose lower end works through said bearing, a core forming bit attached to the lower end of the barrel, releasable interengaging means carried by the stem and barrel respectively and adapted, when engaged, to lock the barrel against longitudinal movement in said stem said means comprising an annular shoulder in the stem having a depending abutment, pivotally mounted members engageable underneath said shoulder and against said abutment and means movable independent of the core barrel and effective to release said members from such engaging position said releasing means including a wedge which works between the upper ends of said pivotallymounted members.

2. The combination with a drill stem and a drilling tool attached to the lower4 end thereof and having an axial bearing, of a core barrel in the stem whose lower end works through said bearing, a core former at the lower end of the barrel, a ring in the barrel having a downwardly and inwardly beveled upward face and forming a depending abutment, releasable means carried by the barrel and engageable lunderneath said ring and against said abutment.

3. The combination with a drill stem and a drilling tool attached to the lower end thereof and having an axial bearing, of a core barrel in the stem whose lower end works through said bearing, a core former at the lower end of the barrel, a ring in the barrel having a depending abutment, releasable means including jointed members, carried by the barrel and engageable underneath said ring and against said abutment, and a yieldable member normally holding said means in such engagement.

4. The combination with a drill stem and a drilling tool attached to the lower end thereof and having an axial bearing of a core barrel in the stem whose lower end works through said bearing, a core former at the lower end of the barrel, a detachable ring in the barrel having a depending abutment, releasable means carried by the barrel and engageable underneath said ring and against said abutment, av yieldable member normally holding said means in such engagement, a re- 'leasing device including awedge operatively connected with said means and adapted to release the same upon upward movement of said device.

5. The combination with a drill stem and a drilling tool attached to the lower end thereofand having an axial bearing of a core barrel in the stem whose lower end works through said bearing, a core `former at the lower end of the barrel, a ring in the barrel having a depending abutment, -releasable means carried by the barrel and including levers having shoulders engageable underneath said ring and against said abutment,

and also including release arms jointed to said levers a yieldable member normally holding said means in such engagement, a releasing device operatively connected with said means andadapted to release the same upon upward movement of said device, and means attached to said barrel with which the releasing device is adapted to engage, upon upward movement thereof, to effect the withdrawal of said barrel from the stem.

6. The combination with a drill stem and a drilling tool attached -to lthe lower end thereof'and Having an axial bearing, of a core barrel in the stem whose lower end is associated with said bearing, a core forming tool arranged beneath the lower end of the barrel, an inwardly extending abutment in the stem, pivotally mounted levers connected to the barrel and having external shoulders engageable underneath said abutment, means normally maintaining such engagement, means in the stem with which said levers are adapted to engage to prevent the y independent rotation of the barrel relative to the stem, releasing mechanism associated with said levers and operable to effect the release thereof, 'said releasing mechanism including arms pivoted to the levers, a headV having means to actuate the arms, said head being movable independent of the core barrel, but operatively connected with the barrel and forming means to withdraw the bar-` rel from the stemf In testimony whereof we have signed our 

